BTW: When i try run the devmode from other folder than system (ie. when i create my own folder for Devmode) i getting GG errors .... :/Probably because GG dont like to starting the game from other folders than default system

Both golemka and Juji say that it is possible. The trick with GameGuard might be that you have to copy not only the files in the NCSOFT folder, i.e. the game per se, but also the NCWest folder with the launcher. I have no idea in which folder GameGuard is located